| APA | UPI. (2012, February 10). In Acronym Geek. Retrieved 11:04, February 10, 2012, from http://www.acronymgeek.com/UPI |
| MLA | "UPI." Acronym Geek. (2012). Acronym Geek. 10 Feb 2012 <http://www.acronymgeek.com/UPI>. |
| MHRA | 'UPI', Acronym Geek, 10 February 2012, <http://www.acronymgeek.com/UPI> [accessed 10 February 2012] |
| Chicago | "UPI", http://www.acronymgeek.com/UPI (accessed February 10, 2012). |
| CBE/CSE | UPI [Internet]. Acronym Geek; 2012 Feb 10 [cited 2012 Feb 10]. Available from: http://www.acronymgeek.com/UPI. |
| Bluebook | UPI, http://www.acronymgeek.com/UPI (last visited February 10, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, UPI, http://www.acronymgeek.com/UPI (optional description here) (as of Feb. 10, 2012, 11:04). |
| AMA | UPI. Acronym Geek. February 10, 2012, 11:04. Available at: http://www.acronymgeek.com/UPI. Accessed February 10, 2012, 11:04. |